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The results of a linear regression model between two inputs, X1 and X2, on an output Y are as follows (Total Sample Size of Study = 50). Given the results, which of the following may be reasonably concluded? Coefficients Term Coef SE Coef T P Constant -1.75680 0.234251 -7.4996 0.000 x1 2.59404 0.039626 65.4627 0.000 x2 -0,00011 0.000719 -0.1535 0.879 Summary of Model S = 0.0752565 R-Sq = 99.50% R-Sq(adj) = 99.45% a. Based on the value for the constant coefficient, data are skewed left b. Astrong/significant positive correlation exists between the input (X41) and the output c. Astrong/significant negative correlation exists between the input (X2) and the output d. All of the above